DiMarzio Ultra Jazz question

Right, I have got sick of the hum of my Yamaha BB605 and feel like an upgrade in sound so have decided to replace the stock pick-ups. After reading Smashes and the Dr Dimento threads and listening to a few soundclips I have fallen for a pair of five string DiMarzio ultra jasses but just have a few quick questions before I fork out the cash on them.
1) The size looks good, and I am happy to make them fit if necessary but am curious to know if these just fit straight in as a one for one replacement or do they need additional covers (the Dimarzio site doesn't have any images).
2) My bass is active with 5 pots - master vol, bass, treble, pick-up blend, mid, and a mid cut switch - will the PUs work fine with this set up?
3) Will I be able to just take out the stock PUs and swap the wires to the new Ultras or is it more complicated. I am happy with basic soldering but my electronics knowledge is a bit rusty.

1) They are one for one replacement for Fenders. The dimensions are listed on DiMarzio website.
2) Yes!
3) Ultra Jazz have four wires (two for each coil; this allows for series/paralles setup). For 2-wire setup you'll need to connect and insulate two of them, or you can add a switch to select series/parallel on the fly. There is enough information in the package also on the website.

Just be careful about the fingerboard radius. DiMarzios are basically made for Fenders. With a different radius you may have different volume levels on different strings. It's a good idea to send them an e-mail, they respond reasonably quick.

Cheers guys, the dimensions didn't seem to be on the DiMarzio site but reckon the holes I have already will be plenty big enough even for 2 bridge size PU's. My yamaha seems to have a very flat fingerboard so that might have to figure in my final decision.
Dave, a special thanks for your pick-up samples - they were a massive factor in my decision. Very useful!!! However I am going to keep listening to the Ultra Jazz and Bart CB samples over the next week to see if the Bart sound starts to grow on me more or whether I still prefer the ultras before I make the purchase

Right, I. After reading Smashes and the Dr Dimento threads and listening to a few soundclips I have fallen for a pair of five string DiMarzio ultra jasses but just have a few quick questions before I fork out the cash on them.

If you want to hear a couple of more Ultra Jazz clips go to my website http://www.chuckamuck.com/guitars/basses and click the sound clips under the green ESP bass. It's an ESP J4 with UltraJazz pickups. I also added push/pull pots for series/parallel switching

For 2-wire setup you'll need to connect and insulate two of them, or you can add a switch to select series/parallel on the fly. There is enough information in the package also on the website.

Click to expand...

So if I connect and insulate two wires on each pick-up, does that mean I have lost any humcancelling properties of the PU (one of my main reasons for upgrading). I will just be putting them in as direct replacements for a start and might move on to the preamp in the future, so no series/parallel switching.
Thanks for your ongoing help guys.